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Wed, 17 Sep 2025 18:50:38 -0700 (PDT) X-Relaying-Domain: purestorage.com Received: from dev-csander.dev.purestorage.com (unknown [IPv6:2620:125:9007:640:ffff::1199]) by c7-smtp-2023.dev.purestorage.com (Postfix) with ESMTP id 6950E340325; Wed, 17 Sep 2025 19:50:37 -0600 (MDT) Received: by dev-csander.dev.purestorage.com (Postfix, from userid 1557716354) id 65ABEE41B42; Wed, 17 Sep 2025 19:50:37 -0600 (MDT) From: Caleb Sander Mateos To: Ming Lei , Jens Axboe Cc: linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, Caleb Sander Mateos Subject: [PATCH 09/17] ublk: don't access ublk_queue in ublk_daemon_register_io_buf() Date: Wed, 17 Sep 2025 19:49:45 -0600 Message-ID: <20250918014953.297897-10-csander@purestorage.com> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20250918014953.297897-1-csander@purestorage.com> References: <20250918014953.297897-1-csander@purestorage.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" For ublk servers with many ublk queues, accessing the ublk_queue in ublk_daemon_register_io_buf() is a frequent cache miss. Get the flags from the ublk_device instead, which is accessed earlier in ublk_ch_uring_cmd_local(). Signed-off-by: Caleb Sander Mateos --- drivers/block/ublk_drv.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/block/ublk_drv.c b/drivers/block/ublk_drv.c index 751ec62655f8..266b46d40886 100644 --- a/drivers/block/ublk_drv.c +++ b/drivers/block/ublk_drv.c @@ -2167,11 +2167,11 @@ ublk_daemon_register_io_buf(struct io_uring_cmd *cm= d, new_registered_buffers =3D io->task_registered_buffers + 1; if (unlikely(new_registered_buffers >=3D UBLK_REFCOUNT_INIT)) return ublk_register_io_buf(cmd, ub, ubq, io, index, issue_flags); =20 - if (!ublk_support_zero_copy(ubq) || !ublk_rq_has_data(req)) + if (!ublk_dev_support_zero_copy(ub) || !ublk_rq_has_data(req)) return -EINVAL; =20 ret =3D io_buffer_register_bvec(cmd, req, ublk_io_release, index, issue_flags); if (ret) --=20 2.45.2